Ultra-wideband circular linear polarization conversion reflection unit and reflection surface

Abstract

The invention relates to an ultra-wideband circular linear polarization conversion reflection unit and a reflection surface, and belongs to the technical field of polarization conversion metasurface, the reflection unit comprises a first metal patch layer, a first dielectric substrate, a second metal patch layer, a second dielectric substrate and a metal ground layer which are arranged in sequence from top to bottom; each of the first metal patch layer and the second metal patch layer comprises an open circular ring and two metal strips, the two metal strips are symmetrically arranged, and the two metal strips are respectively connected with two open ends of the open circular ring; the difference between the opening direction of the open circular ring of the first metal patch layer and the opening direction of the open circular ring of the second metal patch layer is 90 degrees. And the reflecting surface comprises a plurality of ultra-wideband circular linear polarization conversion reflecting units which are arranged in an array or periodically arranged. Based on the cooperative coupling effect of the open circular ring and the symmetrical metal strips, high-efficiency conversion from circularly polarized waves to linearly polarized waves is achieved, the working frequency band range is widened, and remarkable technical universality and market application potential are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of polarization conversion metasurfaces, and particularly relates to an ultra-wideband circular-linear polarization conversion reflection unit and a reflector surface. Background Art

[0002] The polarization of electromagnetic waves refers to the characteristic of the electric field vector varying with time at any position in space during propagation. For the electric field vector of an electromagnetic wave at any given coordinate point in space propagating along the z-axis, according to the phase and amplitude of its electric field components in the x and y directions, the polarization state of the electromagnetic wave can be divided into three polarization forms: linear polarization, circular polarization, and elliptical polarization. According to the conditions that different polarization states of electromagnetic waves need to satisfy, it can be known that after passing through a certain structure, electromagnetic waves have different responses in different polarization directions. When the phase and amplitude meet the corresponding conditions, arbitrary regulation between different polarization forms of electromagnetic waves can be achieved. Polarization regulation plays an important role in communication, radar, imaging, and stealth technologies.

[0003] A metasurface is a two-dimensional structure of metamaterials, which is a two-dimensional structure formed by the periodic arrangement of sub-wavelength-sized artificial units. The electromagnetic characteristics and functions of the metasurface are determined by the structure and specific characteristics of the sub-wavelength elements, as well as their coupling type and strength, and are usually affected by the underlying substrate. The metasurface can provide complete control over the reflected and transmitted fields, and can achieve precise control of the phase, amplitude, and polarization of electromagnetic waves by regulating the geometric structure and material parameters of the sub-wavelength elements. Traditional reflector surfaces cannot flexibly change the polarization mode of the reflected wave. By designing the anisotropic metasurface unit structure, a preset polarization conversion effect can be introduced into the reflected wave, thereby achieving the design purpose.

[0004] However, most of the polarization conversion surfaces involved in the prior art are metasurfaces that convert linear polarization to circular polarization or convert linear polarization to cross polarization, lacking a polarization conversion metasurface that converts circular polarization to linear polarization. Therefore, a reflection unit and a reflector surface based on metasurface units for converting circularly polarized waves to linearly polarized waves are needed. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides an ultra-wideband circular-linear polarization conversion reflection unit and a reflector surface. The technical problems to be solved by the present invention are achieved through the following technical solutions:

[0006] The present invention provides an ultra-wideband circular polarization conversion reflection unit, comprising: a first metal patch layer, a first dielectric substrate, a second metal patch layer, a second dielectric substrate, and a metal ground layer, which are sequentially arranged from top to bottom; both the first metal patch layer and the second metal patch layer include: an open-ring and metal strips, wherein, there are two metal strips, the two metal strips are symmetrically arranged, and the two metal strips are respectively connected to two open ends of the open-ring; the opening directions of the open-rings of the first metal patch layer and the second metal patch layer differ by 90°.

[0007] In an embodiment of the present invention, the opening direction of the open-ring of the second metal patch layer rotates counterclockwise by 90° relative to the opening direction of the open-ring of the first metal patch layer.

[0008] In an embodiment of the present invention, both the first dielectric substrate and the second dielectric substrate are made of the same dielectric material.

[0009] In an embodiment of the present invention, the materials of both the first dielectric substrate and the second dielectric substrate are Arlon AD 255C; the material of the metal ground layer is copper, and the metal ground layer is in direct contact with the second dielectric substrate.

[0010] In an embodiment of the present invention, the outer diameter r of the open-ring is 2.3 mm, and the width wr of the open-ring is 0.1 mm.

[0011] In an embodiment of the present invention, the spacing s between the two metal strips is 2.5 mm; the length l of each metal strip is 1.48 mm, and the width wl is 0.2 mm.

[0012] In an embodiment of the present invention, the amplitude of the x-polarization direction component of the reflected wave electric field of the ultra-wideband circular polarization conversion reflection unit is equal to that of its y-polarization direction component, and the phase difference between the x-polarization direction component and the y-polarization direction component is 90°.

[0013] In an embodiment of the present invention, the operating frequency band of the ultra-wideband circular polarization conversion reflection unit is from 11.79 to 16.96 GHz, and the relative bandwidth is 36%.

[0014] The present invention also provides an ultra-wideband circular polarization conversion reflector surface, comprising the above-mentioned ultra-wideband circular polarization conversion reflection unit, wherein, there are several ultra-wideband circular polarization conversion reflection units, and the several ultra-wideband circular polarization conversion reflection units are arranged in an array or periodically arranged, and the arrangement mode, angle and structural parameters of each ultra-wideband circular polarization conversion reflection unit are independently controlled.

[0015] In one embodiment of the present invention, the ultra-wideband circular-to-linear polarization conversion reflector comprises 20×20 ultra-wideband circular-to-linear polarization conversion reflection units arranged in an array.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The ultra-wideband circular-to-linear polarization conversion reflection unit of the present invention significantly improves the polarization conversion performance and engineering applicability through the 90° rotation setting of two metal patch layers. Based on the synergistic coupling effect of the split ring resonator and the symmetric metal strip, efficient conversion from circularly polarized waves to linearly polarized waves is achieved, broadening the operating frequency band range. At the same time, due to the compact unit layout and standardized processing technology, the overall structure is easy to be integrated and manufactured on a large scale, which can greatly reduce the production cost. Moreover, the shielding design of the metal ground layer can effectively suppress interference signals and improve the anti-interference ability of the system, having significant technical universality and market application potential.

[0018] The ultra-wideband circular-to-linear polarization conversion reflector of the present invention can control the amplitude-phase change of the reflected wave electric field by flexibly adjusting the thickness and electromagnetic parameters of the dielectric substrate or the position of the metal patch layer, so as to adapt to different frequency band communication requirements, such as being compatible with satellite communication, millimeter-wave radar, and mobile communication systems, providing a highly reliable and low-cost solution for electromagnetic regulation in multiple scenarios. The present invention can realize incident left-handed circularly polarized waves or right-handed circularly polarized waves and reflected linearly polarized waves in the frequency band of 11.79 to 16.96 GHz.

[0019] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are specifically given and described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of linearly polarized wave synthesis provided by an embodiment of the present invention;

[0021] Figure 2 is an exploded structural schematic diagram of the ultra-wideband circular-to-linear polarization conversion reflection unit provided by an embodiment of the present invention;

[0022] Figure 3 is a structural schematic diagram of the ultra-wideband circular-to-linear polarization conversion reflection unit provided by an embodiment of the present invention;

[0023] Figure 4 is a structural schematic diagram of the metal patch layer provided by an embodiment of the present invention;

[0024] Figure 5 is a structural schematic diagram of the ultra-wideband circular-to-linear polarization conversion reflection unit provided by an embodiment of the present invention with one metal patch layer provided;

[0025] Figure 6 It is the simulation diagram of the reflection phase of the ultra-wideband circular-linear polarization conversion reflection unit provided with a layer of metal patch layer in the embodiment of the present invention;

[0026] Figure 7 It is the structural schematic diagram of the ultra-wideband circular-linear polarization conversion reflection unit provided with two layers of co-directional metal patch layers in the embodiment of the present invention;

[0027] Figure 8 It is the simulation diagram of the reflection phase of the ultra-wideband circular-linear polarization conversion reflection unit provided with two layers of co-directional metal patch layers in the embodiment of the present invention;

[0028] Figure 9 It is the simulation diagram of the reflection phase of the ultra-wideband circular-linear polarization conversion reflection unit with the second metal patch layer rotated counterclockwise by 45° in the embodiment of the present invention;

[0029] Figure 10 It is the simulation diagram of the reflection coefficients of the TE mode and TM mode of the reflected wave in the embodiment of the present invention;

[0030] Figure 11 It is the simulation diagram of the reflection phases of the TE mode and TM mode of the reflected wave in the embodiment of the present invention;

[0031] Figure 12 It is the simulation diagram of the axial ratio of the reflected signal in the embodiment of the present invention;

[0032] Figure 13 It is the structural schematic diagram of the ultra-wideband circular-linear polarization conversion reflecting surface in the embodiment of the present invention.

[0033] Reference numerals: 100 - the first metal patch layer; 200 - the first dielectric substrate; 300 - the second metal patch layer; 400 - the second dielectric substrate; 500 - the metal ground layer. Detailed implementation manners

[0034] In order to further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following provides a detailed description of an ultra-wideband circular-linear polarization conversion reflection unit and a reflecting surface according to the present invention in combination with the accompanying drawings and specific implementation manners.

[0035] The foregoing and other technical contents, features, and effects of the present invention can be clearly presented in the following detailed description in conjunction with the accompanying drawings. Through the description of the specific implementation manners, a more in-depth and specific understanding of the technical means and effects adopted by the present invention to achieve the predetermined purpose can be obtained. However, the accompanying drawings are only provided for reference and illustration purposes and are not used to limit the technical solutions of the present invention.

[0036] Embodiment 1

[0037] The circularly polarized to linearly polarized wave metasurface has a wider application in wireless communication systems that require high flexibility. This is because after converting the circularly polarized signal into a linearly polarized signal, it can effectively match with traditional linearly polarized receiving systems, increasing the compatibility of the system. For example, in satellite communication and wireless networks, circularly polarized signals can propagate at different angles and azimuths, while linearly polarized signals are more suitable for conventional antennas and receiving devices. However, most of the existing technologies are designed for polarization conversion metasurfaces for linearly polarized waves, and there is a lack of polarization conversion metasurfaces that convert circular polarization to linear polarization. In view of this, the first aspect of the present invention provides an ultra-wideband circular-to-linear polarization conversion reflection unit.

[0038] As Figures 2 to 4 shown, Figure 2 is a schematic exploded view of the ultra-wideband circular-to-linear polarization conversion reflection unit provided by an embodiment of the present invention; Figure 3 is a schematic structural view of the ultra-wideband circular-to-linear polarization conversion reflection unit provided by an embodiment of the present invention; Figure 4 is a schematic structural view of the metal patch layer provided by an embodiment of the present invention.

[0039] In this embodiment, the ultra-wideband circular-to-linear polarization conversion reflection unit includes: a first metal patch layer 100, a first dielectric substrate 200, a second metal patch layer 300, a second dielectric substrate 400, and a metal ground layer 500, which are arranged in sequence from top to bottom; both the first metal patch layer 100 and the second metal patch layer 300 include: an open-ring and metal strips, wherein there are two metal strips, the two metal strips are symmetrically arranged, and the two metal strips are respectively connected to two open ends of the open-ring; the opening directions of the open-rings of the first metal patch layer 100 and the second metal patch layer 300 differ by 90°.

[0040] It should be noted that the ultra-wideband circular-to-linear polarization conversion reflection unit of the first aspect of the present invention significantly improves the polarization conversion performance and engineering applicability through the 90° rotation setting of the two metal patch layers. Based on the synergistic coupling effect of the open-ring and the symmetric metal strips, the efficient conversion from circularly polarized waves to linearly polarized waves is realized, broadening the working frequency band range. At the same time, due to the compact unit layout and standardized processing technology, the overall structure is easy to be mass-produced by integration, which can significantly reduce the production cost, and the shielding design of the metal ground layer can effectively suppress interference signals and improve the anti-interference ability of the system, having significant technical universality and market application potential.

[0041] In addition, such as in satellite communication, circularly polarized signals have better anti-interference ability in atmospheric transmission, but most ground receiving devices use linearly polarized antennas. By efficiently converting circularly polarized signals into linearly polarized signals, the signal reception efficiency can be improved.

[0042] As shown Figure 1 in Figure 1 Figure

[0043] The principle of converting circular polarization to linear polarization is described below. Circularly polarized waves can be divided into left-handed circularly polarized waves and right-handed circularly polarized waves according to the polarization direction. A circularly polarized wave can be decomposed into two linearly polarized waves with equal amplitudes, orthogonal in space, and a phase difference of 90°. Similarly, two circularly polarized waves with opposite rotation directions and equal amplitudes can be synthesized into a linearly polarized wave.

[0044] The component E of the electric field E in the x direction x has the following expression:

[0045]

[0046] where E x is the component of the electric field E in the x direction; is the unit vector; cos is the cosine function; ω is the angular frequency; t is the time; is the phase of the electric field component E x ; k is the propagation constant; z is the z-axis direction.

[0047] The component E of the electric field E in the y direction y has the following expression:

[0048]

[0049] where E y is the component of the electric field E in the y direction; is the unit vector; is the phase of the electric field component E y .

[0050] The electric field E of the left-handed circularly polarized wave LCP has the following expression:

[0051]

[0052] where E LCP is the electric field of the left-handed circularly polarized wave; e is the natural constant; E is the electric field; sin is the sine function; is the phase of the left-handed circularly polarized wave.

[0053] The electric field E of the right-handed circularly polarized wave RCP has the following expression:

[0054]

[0055] where E RCP is the electric field of the right-handed circularly polarized wave; is the phase of the right - hand circularly polarized wave.

[0056] Finally, the electric field E of the left - hand circularly polarized wave LCP and the electric field E of the right - hand circularly polarized wave RCP are combined into the electric field E of the linearly polarized wave LP , and its expression is:

[0057]

[0058] where, E LP is the electric field of the linearly polarized wave; is the phase of the linearly polarized wave.

[0059] Furthermore, through the ultra - wideband circular - to - linear polarization conversion reflection unit of this embodiment, it can be made such that the amplitudes of the x - direction component and the y - direction component of the reflected - wave electric field are equal and the phase difference is 90°, then the electric - field equation of a left - hand circularly polarized incident wave is:

[0060]

[0061] where, E0 is the electric - field strength of this electric field.

[0062] After being reflected by this metasurface, a phase shift of is generated for the electric - field phase of the direction component, and a phase shift of is generated for the electric - field phase of the direction component, and the electric - field equation of the reflected wave is obtained as:

[0063]

[0064] where, is the phase change of the reflected wave relative to the incident wave.

[0065] After simplification, it is obtained:

[0066]

[0067] That is:

[0068]

[0069] Similarly for the incident right - hand circularly polarized wave. Based on the above, a circularly polarized incident wave can obtain a linearly polarized reflected wave through the designed reflecting surface.

[0070] It should be noted that the ultra-wideband circular-to-linear polarization conversion reflection unit in this embodiment can achieve the function of polarization conversion based on controlling the amplitude and phase changes of the reflected wave electric field, filling the technical gap in the polarization conversion of circularly polarized waves. Further based on this principle, a metasurface integrating multiple functions, such as beamforming and wavefront modulation, can also be designed, providing more possibilities for future intelligent wireless communication and radar systems.

[0071] In an alternative embodiment, the ultra-wideband circular-to-linear polarization conversion reflection unit consists of two dielectric substrates, two metal patch layers, and one metal ground plane. Among them, the opening direction of the open-ring of the second metal patch layer 300 rotates counterclockwise by 90° relative to the open-ring of the first metal patch layer 100. By rotating counterclockwise by 90°, the phase difference between the x-polarization component and the y-polarization component of the reflected wave reaches 90°, thereby realizing the conversion from circularly polarized wave to linearly polarized wave. In addition, setting the structural parameters of the first metal patch layer 100 and the second metal patch layer 300 to be the same can also ensure that the x-polarization component and the y-polarization component of the reflected wave electric field of the ultra-wideband circular-to-linear polarization conversion reflection unit have equal amplitudes.

[0072] Exemplarily, the first dielectric substrate 200 and the second dielectric substrate 400 both adopt the same dielectric material.

[0073] Specifically, the materials of the first dielectric substrate 200 and the second dielectric substrate 400 are both Arlon AD 255C, and its relative dielectric constant is 2.6.

[0074] Exemplarily, the material of the metal ground plane 500 is copper, and the metal ground plane 500 is in direct contact with the second dielectric substrate 400, such as the metal ground plane 500 is closely attached to the second dielectric substrate 400.

[0075] Please refer to Figure 3 and Figure 4 , exemplarily, the period p of the ultra-wideband circular-to-linear polarization conversion reflection unit is 5.2 mm, the thickness d1 of the first dielectric substrate 200 is 1.2 mm, the thickness d2 of the second dielectric substrate 400 is 1.8 mm, the first metal patch layer 100 is disposed above the first dielectric substrate 200, the second metal patch layer 300 is disposed above the second dielectric substrate 400, and the metal ground plane 500 is disposed below the second dielectric substrate 400.

[0076] Exemplarily, the structures and structural parameters of the first metal patch layer 100 and the second metal patch layer 300 are the same. Among them, the outer diameter r of the open-ring is 2.3 mm, the width wr of the open-ring is 0.1 mm; the spacing s between the two metal strips is 2.5 mm; the length l of each metal strip is 1.48 mm, and the width wl is 0.2 mm.

[0077] Specifically, the amplitudes of the x-polarization direction component and the y-polarization direction component of the reflected wave electric field of the conversion reflection unit are equal, and the phase difference between the x-polarization direction component and the y-polarization direction component is 90°.

[0078] It should be noted that by rotating the opening direction of the split ring of the second metal patch layer 300 counterclockwise by 90° relative to the split ring of the first metal patch layer 100, the amplitudes of the x-polarization direction component and the y-polarization direction component of the reflected wave electric field are equal, and the phase difference reaches 90°, realizing the conversion from circular polarization to linear polarization. In addition, by adopting the structure of double-layer metal patches, the working bandwidth of the metasurface is greatly broadened.

[0079] The setting principle of the metal patch layer is further illustrated by examples below.

[0080] As Figure 5 shown, Figure 5 is a schematic structural diagram of an ultra-wideband circular-linear polarization conversion reflection unit provided with a layer of metal patch layer according to an embodiment of the present invention.

[0081] It includes: a first metal patch layer 100, a first dielectric substrate 200, and a metal ground layer 500 arranged in sequence from top to bottom. The first metal patch layer 100 includes a split ring and a metal strip. Then, simulation is carried out on it, and the simulation result is as Figure 6 shown, Figure 6 is a simulation diagram of the reflection phase of an ultra-wideband circular-linear polarization conversion reflection unit provided with a layer of metal patch layer according to an embodiment of the present invention.

[0082] It can be seen from Figure 6 that the reflection phase difference between the TE mode (transverse electric mode) and the TM mode (transverse magnetic mode) of this unit is about 180°.

[0083] To achieve circular-linear polarization conversion, the reflection phase difference between the TE mode and the TM mode of the metasurface unit needs to reach 90°. By stacking metal patch layers and adjusting the positions of two metal patches, the reflection phases in different modes of the metasurface can be adjusted.

[0084] As Figure 7 shown, Figure 7 is a schematic structural diagram of an ultra-wideband circular-linear polarization conversion reflection unit provided with two layers of co-directional metal patch layers according to an embodiment of the present invention.

[0085] It includes: a first metal patch layer 100, a first dielectric substrate 200, a second metal patch layer 300, a second dielectric substrate 400, and a metal ground layer 500 arranged in sequence from top to bottom, and the opening directions of the split rings of the first metal patch layer 100 and the second metal patch layer 300 are the same. Then, simulation is carried out on it, and the simulation result is as Figure 8As shown Figure 8 is the simulation diagram of the reflection phase of the ultra-wideband circular wire polarization conversion reflection unit provided by the embodiment of the present invention, which is provided with two layers of co-directional metal patch layers.

[0086] It can be seen from Figure 8 that when the method of superimposing metal patches is used for the design of the metasurface, the reflection phase of the TE mode has obvious changes. Compared with the metasurface unit of a single-layer metal sheet, the reflection phase of the TE mode of the metasurface with one layer of co-directional metal patches superimposed leads by nearly 280° at 10 GHz, and the reflection phases of the TE mode and the TM mode reach in-phase at 13.4 GHz.

[0087] Furthermore, by controlling the position of the metal patch layer to control the reflection phase of the metasurface unit, for example, rotating the second metal patch layer 300 counterclockwise by 45° relative to the first metal patch layer 100, that is, making the opening directions of the opening rings of the first metal patch layer 100 and the second metal patch layer 300 differ by 45°, the simulation results are as Figure 9 shown Figure 9 is the simulation diagram of the reflection phase of the ultra-wideband circular wire polarization conversion reflection unit with the second metal patch layer rotated counterclockwise by 45° provided by the embodiment of the present invention.

[0088] It can be seen from Figure 9 that within the frequency band of 13 to 15 GHz, the reflection phase difference between the TE mode and the TM mode of the metasurface unit is about 200°. At this time, the metasurface unit has a fixed reflection phase difference within a relatively wide frequency band, meeting part of the design requirements.

[0089] When the second metal patch layer 300 is rotated counterclockwise by 90° relative to the first metal patch layer 100, the TE mode and the TM mode have a fixed 90° reflection phase difference within the frequency band of 11.79 to 16.96 GHz, thus completing the design of the circular wire polarization conversion reflection type metasurface unit.

[0090] Furthermore, electromagnetic simulations are respectively carried out on the ultra-wideband circular wire polarization conversion reflection unit provided in the first aspect of the present invention, and the simulation results are as Figures 10 to 12 shown Figure 10 is the simulation diagram of the reflection coefficients of the TE mode and the TM mode of the reflected wave provided by the embodiment of the present invention; Figure 11 is the simulation diagram of the reflection phases of the TE mode and the TM mode of the reflected wave provided by the embodiment of the present invention; Figure 12 is the simulation diagram of the axial ratio of the reflected signal provided by the embodiment of the present invention.

[0091] It can be seen from Figure 10 and Figure 11It can be seen that the ultra-wideband circular-linear polarization conversion reflection unit in the first aspect of this embodiment satisfies that the reflection amplitudes of the x-direction component and the y-direction component of the reflected wave are equal within the working frequency band, and the phase difference is about 90°.

[0092] From Figure 12 It can be seen that for the ultra-wideband circular-linear polarization conversion reflection unit in the first aspect of the present invention, within the working frequency band, the axial ratio of the reflected wave is above 20 dB. It can be considered that the polarization characteristic of the reflected wave approaches linear polarization and is close to the ideal linear polarization state. In other words, the axial ratio refers to the logarithm of the ratio of the major axis to the minor axis of the elliptically polarized wave. An axial ratio above 20 dB indicates that the polarization characteristic of the reflected wave approaches linear polarization.

[0093] Therefore, when the second-layer metal patch layer 300 rotates counterclockwise by 90° relative to the first-layer metal patch layer 100, the reflection phase difference in the TE mode and the TM mode can reach 90° and has a good bandwidth. At this time, ultra-wideband circular-linear polarization conversion can be achieved.

[0094] It should be noted that the working frequency band of the ultra-wideband circular-linear polarization conversion reflection unit in the first aspect of this embodiment is from 11.79 to 16.96 GHz, the relative bandwidth is 36%, and the linear polarization axial ratio within the polarization conversion bandwidth is above 20 dB, greatly broadening the working bandwidth of the reflective metasurface and achieving polarization conversion in a wide frequency band.

[0095] As Figure 13 shown, Figure 13 is a schematic structural diagram of the ultra-wideband circular-linear polarization conversion reflecting surface provided by the embodiment of the present invention.

[0096] The second aspect of the present invention provides an ultra-wideband circular-linear polarization conversion reflecting surface, in which a plurality of ultra-wideband circular-linear polarization conversion reflection units are provided, and the plurality of ultra-wideband circular-linear polarization conversion reflection units are arranged in an array or in a periodic arrangement.

[0097] In an optional implementation manner, the ultra-wideband circular-linear polarization conversion reflecting surface includes N×N ultra-wideband circular-linear polarization conversion reflection units arranged in an array, that is, N ultra-wideband circular-linear polarization conversion reflection units arranged in an array are provided in each row and each column.

[0098] Exemplarily, the ultra-wideband circular-linear polarization conversion reflecting surface includes 20×20 ultra-wideband circular-linear polarization conversion reflection units arranged in an array.

[0099] In an optional implementation manner, the arrangement mode, angle and structural parameters of each ultra-wideband circular-linear polarization conversion reflection unit are independently controlled.

[0100] It can be understood that several ultra-wideband circular-linear polarization conversion reflection units provided in the second aspect of the present invention are provided in the ultra-wideband circular-linear polarization conversion reflector, and therefore, it has beneficial effects similar to those of the embodiments of the first aspect. At the same time, for the technical details not disclosed in the embodiments of the second aspect of the present invention, reference may be made to the description of the embodiments of the first aspect for understanding.

[0101] The ultra-wideband circular-linear polarization conversion reflector of the present invention can control the amplitude-phase change of the reflected wave electric field by flexibly adjusting the thickness and electromagnetic parameters of the dielectric substrate or the position of the metal patch layer, so as to adapt to different frequency band communication requirements, such as being compatible with satellite communication, millimeter-wave radar and mobile communication systems, and providing a highly reliable and low-cost solution for multi-scene electromagnetic regulation. The present invention can achieve incident left-handed circularly polarized waves or right-handed circularly polarized waves and reflect linearly polarized waves in the frequency band of 11.79 to 16.96 GHz.

[0102] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant are intended to cover non-exclusive inclusion, so that an article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the article or device including the element. "Connection" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The orientation or positional relationship indicated by "up", "down", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0103] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. An ultra-wideband circular linear polarization conversion reflection unit, characterized in that: include: A first metal patch layer (100), a first dielectric substrate (200), a second metal patch layer (300), a second dielectric substrate (400), and a metal ground layer (500) are sequentially arranged from top to bottom; The first metal patch layer (100) and the second metal patch layer (300) both comprise: an open circular ring and a metal strip, wherein two metal strips are provided, the two metal strips are symmetrically arranged, and the two metal strips are respectively connected to two open ends of the open circular ring; The opening directions of the open circular ring of the first metal patch layer (100) and the open circular ring of the second metal patch layer (300) differ by 90°.

2. The ultra-wideband circular linear polarization conversion reflection unit according to claim 1, characterized in that: The opening direction of the open circular ring of the second metal patch layer (300) is rotated 90° counterclockwise relative to the opening circular ring of the first metal patch layer (100).

3. The ultra-wideband circular linear polarization conversion reflection unit according to claim 1, characterized in that: The first dielectric substrate (200) and the second dielectric substrate (400) are both made of the same dielectric material.

4. The ultra-wideband circular linear polarization conversion reflection unit according to claim 3, characterized in that: The materials of the first dielectric substrate (200) and the second dielectric substrate (400) are both Arlon AD 255C; the material of the metal layer (500) is copper, and the metal layer (500) is in direct contact with the second dielectric substrate (400).

5. The ultra-wideband circular linear polarization conversion reflection unit according to claim 1, characterized in that: The outer diameter r of the open circular ring is 2.3 mm, and the width wr of the open circular ring is 0.1 mm.

6. The ultra-wideband circular linear polarization conversion reflection unit according to claim 1, characterized in that: The distance between the two metal strips is s=2.5 mm; the length l=1.48 mm and the width wl=0.2 mm of each metal strip.

7. The ultra-wideband circular linear polarization conversion reflection unit according to claim 1, characterized in that: The amplitude of the x-polarization direction component of the reflected wave electric field of the ultra-wideband circular linear polarization conversion reflection unit is equal to that of the y-polarization direction component thereof, and the phase difference between the x-polarization direction component and the y-polarization direction component is 90°.

8. The ultra-wideband circular linear polarization conversion reflection unit according to claim 1, characterized in that: The operating frequency band of the ultra-wideband circular linear polarization conversion reflector is 11.79 to 16.96 GHz, and the relative bandwidth is 36%.

9. An ultra-wideband circular linear polarization conversion reflector, characterized in that: It comprises the ultra-wideband circular line polarization conversion reflection unit as described in any one of claims 1 to 8, wherein a plurality of the ultra-wideband circular line polarization conversion reflection units are provided, and the plurality of the ultra-wideband circular line polarization conversion reflection units are array-arranged or periodically arranged, wherein the arrangement mode, angle and structural parameters of each of the ultra-wideband circular line polarization conversion reflection units are independently controlled.

10. The ultra-wideband circular linear polarization conversion reflector according to claim 9, characterized in that: The ultra-wideband circular linear polarization conversion reflection surface comprises 20×20 ultra-wideband circular linear polarization conversion reflection units arranged in an array.

Images